Improved book-dxnunfl machine



@attire tv-aars @anni @ffice GEORGE DOWNING, OF SGHUYLERVILLE, NEW YORK,ASSIGNOR .TO

Hill/[SELF AND lROBERT HERMANCE, OF THE SAME PLACE. Letters Patent No.70,978, dated November 19, 1867.

IMPROVED ROCK-DRILLIN G MACHINE.

tro ALL WHoMIfr MAY conocen:-

Be it known that I, GEORGE DOWNING,ofSchuylervillc, in the county ofSaratoga, and State of NewYork, have invented a new and usefulImprovement in Drilling Machine; and I do hereby declare that thefollowing is a full,` clear, and exact description thereof, which willenable others skilled in the art to make and use the same, referencebeing had to the accompanying drawings, forming part of thisspeeication, in which- Figure 1 is a vertical longitudinal section of myimproved machine, taken through the line :e ze, fig. 2.

. Figure 2 is a top view of the same. I

Figure 8 is adetail .view of'a modification of the drill.

Similar letters of reference indicate like parts.

My invention has for itsobject to furnish an improved drilling machine,simple in construction, easy to be operated, which can be so adjustedthat the full force of the blow may be effective whether drillinga-shallow or deep hole, and which will drill vertical or inclined holeswith equal facility; and it consists inthe combination 0f thecrank-wheels, shaft, double cams, drill-spindle, and sliding plate, witheachother and with the upright part of the frame; in thecombination ofthe lever, spring-arm, pawls, and ratchet-wheel, with each other andwith the drill-spindle, sliding plate, and crank-wheel; in thecombination of thel shaft, toothed wheels, pawls, arms, and racks, witheach other and with the sliding plate and upright part of the frame; andin connecting the upright part of the frame to the horizontal part withhinges and adjustable hooks, the whole being co'nstructed and arrangedas hereinafter more fully descured. i

A is an ordinary drill, secured tothe drillspindle B by a setscrew, inthe usual manner. The spindle B works up and down in holes in theflanges c', projecting from the upper and lower parts of the slidingplate C, which slides up and down along the forward side of the uprightD, being kept in place'by the guides d. The blow is given by the coiledVwire spring E, assisted by the Weight of the drill-spindle. The upperend of the spring E rests against the under side oi' the upper flangee', and its lower end against the iianged. ring F, adjustably secured tothe spindle B by a set-screw. The drillspindle B is raised by the doublecams G, acting upon the flanged ring F upon both sides of the saidspindle. The cams G are attached to the middle part of the shaft H, andwork in a vertical slot formed in the sliding plate C and upright D. Theshaft H revolves in bearings attached to the sliding .plate C, so as tobe raised and lowered with said plat-e, and to its ends are attached thecrank-wheels I, which are made heavy, 'so as to actas balance-wheels. Jis a ratchet-wheel, placed upon the spindle B, just above the upperiiange c', and made to carry the said spindle with it, by having atongue formed upon it entering a longitudinal groove formed in 4the saidspindle.. K is a pawl, pivoted to the arm L, and held forward againstlthe teeth of the ratchet-wheel J by the spring M. The arm L is operatedto revolve the ratchet.- -wheel-J and spindle B, by the lever N, into aslot in the 'upper end of which the free 4end of the arm L enters.

The lever N is pivoted to the sliding plate C, and itsf lower end isacted-upon by stop-pins or projections formed uponor attached to theinner side of the crank-wheel I, so that the spindle and drill may bepartially revolved after each blow. B is a spring; the free end -ofwhich rests against the arm L, to' draw it back .as soon as the lowerend of the lever N is released from the wheel I. C is a pawl, takinghold of the ratchet-wheel I to hold stationary while the pawl K is beingdrawn back to take another hold. O is a shaft, revolving in bearingsuponthe rear side of the upright D, and having toothed wheels? attachedto its ends,'the teeth of which mesh into the teeth of the racks R,attached to the rear sides ofthe edges of the sliding plate C. Thewheels P and shaft O are revolved to raise sliding-plate C by the pawlS, pivoted to the arm or lever T, and held down against the teeth of oneof the wheels P by the spring U.' The sliding plate is held in place,while the machine is being operated, by the pawl V taking hold oftheteeth of the other wheel l?, and which inust be removed from the saidteeth before the said plate C can be lowered. The lower end of theupright D is connected to the horizontal part Wvof the frame of themachine by the hinges X, so that the upright D may be set vertical, orinclined at any angle, according to the direction in which the hole isto be drilled. Y are hooks, pivoted to the edges of the upright D, andhooking into one or the other of the staples or eyes attached to theedges of the horizontal frame W, according to the angle at which theupright D is set. Z' represents a weight, placed upon the rear end of

